# Subaru Telescope Primary Mirror In-Situ Measured Reflectivity # Coated with Aluminum on 2022-08-04 # Opened the vacuum chamber on 2022-08-08 # Measured with Subaru Portable Spectrophotometer (SPS) on 2025-04-25 (995 days after) # Measured three times at around the position 3 # Data between 950 nm and 1650 nm are also available (SPS-XWW). # Contact: Hirofumi Okita (okita14@naoj.org) # # Wavelength (nm) Pos.3 #1 Pos.3 #2 Pos.3 #3 1000 88.68 88.74 89.13 998 89.03 87.84 88.88 996 88.94 87.52 86.96 994 88.35 87.57 88.86 992 88.16 87.78 88.42 990 88.40 87.75 88.51 988 88.28 87.75 88.66 986 87.64 87.30 88.03 984 88.04 88.32 87.91 982 88.79 88.12 87.77 980 87.93 86.62 88.92 978 87.95 88.16 88.23 976 87.83 87.51 88.08 974 87.90 87.59 87.93 972 87.57 87.66 87.76 970 88.41 86.49 87.62 968 87.87 87.12 87.54 966 87.50 88.50 87.73 964 87.47 87.42 87.95 962 87.60 87.29 87.81 960 88.03 86.95 88.23 958 88.11 86.82 87.95 956 87.01 86.52 87.91 954 86.78 87.15 86.92 952 87.81 87.59 87.38 950 86.86 86.74 86.85 948 86.66 86.80 86.68 946 87.08 86.79 86.69 944 87.26 87.20 87.25 942 86.64 86.34 86.85 940 86.62 86.41 87.05 938 86.36 86.34 87.08 936 86.93 86.82 86.79 934 86.54 86.17 86.48 932 86.44 86.07 87.04 930 85.89 85.67 86.81 928 85.98 86.06 85.89 926 85.96 85.85 86.37 924 85.45 85.67 86.51 922 85.94 85.67 85.67 920 85.53 85.46 86.67 918 85.48 85.43 85.89 916 85.93 85.12 85.07 914 85.44 85.27 85.36 912 84.96 84.95 84.98 910 85.13 84.91 85.17 908 85.39 84.92 85.39 906 84.78 84.67 85.38 904 84.80 84.61 84.85 902 84.36 84.53 84.79 900 83.86 84.10 84.70 898 84.35 84.08 84.42 896 84.14 84.01 84.30 894 83.88 83.61 84.22 892 83.50 83.23 83.61 890 83.73 83.41 83.70 888 83.31 83.08 83.90 886 83.23 83.22 83.40 884 83.12 83.02 83.14 882 82.75 82.54 83.16 880 83.05 82.57 82.81 878 82.85 82.96 82.69 876 82.49 82.20 82.66 874 82.47 82.62 82.55 872 82.42 82.15 82.66 870 82.19 82.38 82.49 868 81.74 82.07 82.12 866 81.77 81.38 82.08 864 81.36 81.73 81.90 862 81.46 81.44 81.56 860 81.48 80.96 81.25 858 81.49 81.25 81.43 856 80.96 80.90 81.62 854 80.86 81.25 81.32 852 81.15 80.71 80.72 850 80.76 80.48 81.39 848 80.63 81.07 80.91 846 80.47 80.80 80.53 844 80.55 80.57 80.53 842 80.32 80.32 80.42 840 80.30 80.33 80.57 838 80.13 80.20 80.53 836 79.93 80.04 79.84 834 80.36 80.22 80.07 832 80.08 80.38 80.44 830 80.32 80.29 80.47 828 80.26 79.97 80.20 826 80.21 80.22 80.28 824 80.16 80.04 80.72 822 80.59 79.82 80.58 820 79.94 80.01 80.34 818 80.08 80.18 80.40 816 80.57 79.61 80.34 814 80.32 80.16 80.37 812 79.85 80.48 80.34 810 80.23 80.13 80.59 808 80.46 80.10 80.62 806 80.32 80.31 80.36 804 80.61 80.46 80.57 802 80.51 80.88 80.86 800 80.44 80.77 80.89 798 80.43 80.34 81.01 796 80.61 80.45 80.71 794 80.88 80.70 80.90 792 80.47 80.93 80.93 790 80.95 80.75 80.93 788 81.14 81.25 81.34 786 81.17 80.89 81.35 784 81.25 81.07 81.24 782 81.34 81.01 81.50 780 81.50 81.60 81.46 778 81.40 81.38 81.51 776 81.22 81.77 81.57 774 81.78 81.58 81.52 772 81.55 81.57 81.73 770 81.89 81.67 82.00 768 81.84 81.79 82.04 766 82.00 81.65 82.14 764 81.81 81.75 81.87 762 81.95 81.88 82.00 760 81.95 81.89 82.58 758 82.34 81.82 82.55 756 82.22 82.25 82.41 754 82.06 82.34 82.34 752 82.15 82.47 82.54 750 82.33 82.33 82.83 748 82.56 82.34 82.56 746 82.51 82.57 82.72 744 82.54 82.44 82.72 742 82.69 82.55 82.69 740 82.83 82.50 82.70 738 82.68 82.72 82.77 736 82.69 82.69 83.03 734 82.84 83.02 82.98 732 82.92 82.94 83.23 730 82.81 82.90 83.26 728 82.84 83.20 83.01 726 83.01 82.79 83.05 724 83.10 82.91 83.38 722 82.90 83.08 83.45 720 83.37 83.22 83.58 718 83.23 83.21 83.48 716 83.17 83.05 83.42 714 83.24 83.21 83.34 712 83.16 83.18 83.26 710 83.29 83.35 83.41 708 83.34 83.29 83.42 706 83.55 83.25 83.41 704 83.55 83.44 83.63 702 83.41 83.56 83.54 700 83.36 83.57 83.63 698 83.62 83.60 83.65 696 83.61 83.53 83.87 694 83.61 83.62 84.06 692 83.58 83.63 83.92 690 83.96 83.55 83.78 688 83.58 83.68 83.76 686 83.54 83.70 83.81 684 83.81 83.83 83.92 682 83.65 83.88 84.04 680 83.59 83.80 83.78 678 83.70 83.82 83.86 676 83.91 83.75 84.14 674 83.91 83.89 84.09 672 83.83 83.98 84.05 670 84.05 84.09 84.16 668 83.89 83.75 84.26 666 83.95 84.03 84.19 664 83.98 84.22 84.35 662 84.03 83.97 84.13 660 84.02 83.97 84.47 658 84.10 84.01 84.28 656 84.12 84.25 84.24 654 84.21 84.18 84.24 652 84.13 84.20 84.40 650 84.03 84.26 84.30 648 84.12 84.36 84.31 646 84.10 84.11 84.36 644 84.15 84.44 84.51 642 84.33 84.35 84.59 640 84.20 84.41 84.51 638 84.16 84.27 84.43 636 84.34 84.44 84.48 634 84.22 84.58 84.39 632 84.20 84.47 84.32 630 84.31 84.42 84.42 628 84.51 84.47 84.54 626 84.22 84.39 84.55 624 84.38 84.49 84.38 622 84.26 84.58 84.72 620 84.40 84.51 84.45 618 84.29 84.51 84.55 616 84.47 84.55 84.68 614 84.33 84.40 84.73 612 84.54 84.42 84.75 610 84.31 84.53 84.57 608 84.67 84.62 84.67 606 84.35 84.63 84.66 604 84.51 85.05 84.73 602 84.41 84.80 84.79 600 84.36 84.50 84.46 598 84.53 84.28 84.52 596 84.53 84.61 84.62 594 84.51 84.58 84.79 592 84.63 84.71 84.63 590 84.52 84.75 84.59 588 84.56 84.68 84.61 586 84.51 84.64 84.68 584 84.54 84.54 84.90 582 84.46 84.69 84.73 580 84.55 84.68 84.85 578 84.36 84.59 84.68 576 84.57 84.61 84.74 574 84.56 84.86 84.80 572 84.61 84.79 84.84 570 84.58 84.76 84.68 568 84.57 84.58 84.70 566 84.66 84.92 84.85 564 84.60 84.73 84.92 562 84.50 84.88 84.79 560 84.50 84.80 84.73 558 84.53 84.67 84.92 556 84.55 84.66 85.05 554 84.67 84.55 84.99 552 84.59 84.51 84.75 550 84.53 84.68 84.55 548 84.44 84.73 85.00 546 84.58 84.68 84.85 544 84.61 84.76 84.88 542 84.65 84.77 84.83 540 84.58 84.54 84.83 538 84.50 84.70 84.82 536 84.48 84.72 84.75 534 84.68 84.57 84.70 532 84.48 84.63 84.59 530 84.59 84.69 84.79 528 84.63 84.69 84.66 526 84.53 84.84 84.70 524 84.55 84.66 84.70 522 84.65 84.75 84.82 520 84.25 84.65 84.56 518 84.31 84.59 84.64 516 84.40 84.39 84.58 514 84.52 84.59 84.63 512 84.63 84.60 84.66 510 84.62 84.57 84.43 508 84.51 84.50 84.67 506 84.48 84.72 84.56 504 84.49 84.51 84.53 502 84.60 84.49 84.55 500 84.50 84.51 84.65 498 84.16 84.62 84.61 496 84.50 84.51 84.44 494 84.29 84.79 84.47 492 84.19 84.54 84.72 490 84.28 84.41 84.47 488 84.23 84.59 84.19 486 84.40 84.41 84.45 484 84.37 84.55 84.41 482 84.28 84.66 84.46 480 84.25 84.48 84.64 478 84.48 84.54 84.32 476 84.20 84.43 84.40 474 84.30 84.49 84.36 472 84.21 84.71 84.21 470 84.54 84.47 84.12 468 84.18 84.22 84.59 466 84.27 84.30 84.36 464 84.17 84.09 84.14 462 83.85 84.35 84.02 460 83.91 84.19 84.05 458 83.57 84.20 83.99 456 84.21 84.03 84.32 454 83.86 84.01 83.92 452 84.16 84.38 83.67 450 83.78 84.00 84.06 448 83.97 84.06 84.19 446 83.89 84.20 84.08 444 83.78 84.01 83.59 442 84.08 83.93 84.45 440 83.96 83.84 83.72 438 83.65 83.86 83.53 436 83.82 83.83 83.48 434 83.91 83.79 83.85 432 83.90 83.91 83.69 430 84.05 84.09 83.94 428 83.75 83.66 84.18 426 83.66 83.80 83.95 424 83.13 83.74 83.76 422 83.39 83.67 83.74 420 83.43 83.47 83.62 418 83.68 83.50 83.55 416 83.81 83.45 83.92 414 83.33 83.19 83.30 412 83.48 83.88 83.56 410 83.41 83.07 83.35 408 83.40 82.75 83.56 406 83.53 83.12 82.98 404 83.49 82.97 82.81 402 83.14 83.39 82.72 400 83.60 84.24 83.46 398 83.23 82.86 82.84 396 83.10 83.39 83.57 394 83.25 83.04 83.31 392 83.24 83.58 83.64 390 82.55 83.27 82.69 388 82.32 82.56 82.01 386 82.97 82.99 82.65 384 82.85 82.91 83.07 382 82.90 82.37 82.37 380 82.42 82.39 81.72 1650 92.60 92.66 92.98 1640 92.63 92.68 93.02 1630 92.61 92.69 93.01 1620 92.62 92.69 93.02 1610 92.63 92.69 93.02 1600 92.62 92.68 93.02 1590 92.62 92.69 93.00 1580 92.60 92.67 92.99 1570 92.59 92.66 92.98 1560 92.58 92.67 92.97 1550 92.57 92.65 92.96 1540 92.56 92.63 92.95 1530 92.54 92.61 92.94 1520 92.53 92.60 92.92 1510 92.50 92.58 92.90 1500 92.49 92.56 92.88 1490 92.48 92.54 92.87 1480 92.45 92.53 92.84 1470 92.43 92.51 92.82 1460 92.42 92.49 92.80 1450 92.39 92.46 92.78 1440 92.37 92.44 92.76 1430 92.34 92.43 92.75 1420 92.32 92.41 92.73 1410 92.30 92.39 92.70 1400 92.27 92.36 92.67 1390 92.25 92.33 92.66 1380 92.22 92.30 92.63 1370 92.20 92.29 92.61 1360 92.18 92.26 92.57 1350 92.14 92.23 92.55 1340 92.11 92.20 92.51 1330 92.07 92.17 92.48 1320 92.05 92.13 92.46 1310 92.00 92.10 92.42 1300 91.98 92.07 92.39 1290 91.94 92.03 92.35 1280 91.90 92.00 92.32 1270 91.87 91.96 92.28 1260 91.82 91.93 92.24 1250 91.78 91.88 92.20 1240 91.74 91.84 92.16 1230 91.69 91.79 92.11 1220 91.64 91.75 92.06 1210 91.59 91.70 92.01 1200 91.53 91.64 91.95 1190 91.46 91.58 91.89 1180 91.41 91.53 91.83 1170 91.34 91.47 91.76 1160 91.27 91.39 91.69 1150 91.20 91.31 91.62 1140 91.11 91.24 91.56 1130 91.03 91.15 91.45 1120 90.94 91.07 91.36 1110 90.85 90.98 91.27 1100 90.73 90.87 91.15 1090 90.62 90.75 91.06 1080 90.49 90.64 90.92 1070 90.36 90.50 90.79 1060 90.22 90.36 90.66 1050 90.05 90.20 90.49 1040 89.89 90.03 90.31 1030 89.70 89.85 90.13 1020 89.49 89.64 89.93 1010 89.27 89.41 89.71 1000 89.00 89.17 89.43 990 88.72 88.89 89.16 980 88.42 88.59 88.86 970 88.07 88.25 88.51 960 87.69 87.87 88.13 950 87.26 87.43 87.69